问题描述
我将QCompleter
与QLineEdit
一起使用,并且我想动态更新QCompleter
的模型.即模型的内容根据QLineEdit
的文本进行了更新.
I use QCompleter
with QLineEdit
, and I want to update QCompleter
's model dynamically. i.e. the model's contents are updated according to QLineEdit
's text.
1)mdict.h
1) mdict.h
#include <QtGui/QWidget>
class QLineEdit;
class QCompleter;
class QModelIndex;
class mdict : public QWidget
{
Q_OBJECT
public:
mdict(QWidget *parent = 0);
~mdict() {}
private slots:
void on_textChanged(const QString &text);
private:
QLineEdit *mLineEdit;
QCompleter *mCompleter;
};
2)mdict.cpp
2) mdict.cpp
#include <cassert>
#include <QtGui>
#include "mdict.h"
mdict::mdict(QWidget *parent) : QWidget(parent), mLineEdit(0), mCompleter(0)
{
mLineEdit = new QLineEdit(this);
QPushButton *button = new QPushButton(this);
button->setText("Lookup");
QHBoxLayout *layout = new QHBoxLayout(this);
layout->addWidget(mLineEdit);
layout->addWidget(button);
setLayout(layout);
QStringList stringList;
stringList << "m0" << "m1" << "m2";
QStringListModel *model = new QStringListModel(stringList);
mCompleter = new QCompleter(model, this);
mLineEdit->setCompleter(mCompleter);
mLineEdit->installEventFilter(this);
connect(mLineEdit, SIGNAL(textChanged(const QString&)),
this, SLOT(on_textChanged(const QString&)));
}
void mdict::on_textChanged(const QString &)
{
QStringListModel *model = (QStringListModel*)(mCompleter->model());
QStringList stringList;
stringList << "h0" << "h1" << "h2";
model->setStringList(stringList);
}
我希望当我输入h
时,它应该为我提供一个包含h0
,h1
和h2
的自动完成列表,并且我可以使用keyborad来选择项目.但这并不像我预期的那样.
I expect when I input h
, it should give me a auto-complete list with h0
, h1
, and h2
and I could use keyborad to select item. But it doesn't behavior as I expected.
似乎应该在QLineEdit
发出textChanged
信号之前设置模型.一种方法是重新实现keyPressEvent
,但要获取QLineEdit
的文本涉及很多条件.
It seems that the model should be set before QLineEdit
emits textChanged
signal. One way is to reimplement keyPressEvent
, but it involves many conditions to get QLineEdit
's text.
所以,我想知道是否有一种简单的方法可以动态更新QCompleter
的模型?
So, I want to know is there an easy way to update QCompleter
's model dynamically?
推荐答案
哦,我找到了答案:
使用信号textEdited
代替textChanged
.
调试QT的源代码告诉了我答案.
Debuging QT's source code told me the answer.
这篇关于如何动态更新QCompleter的模型的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!